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Use "mastheads" in a sentence
"I tacked back and forth and wore for two solid hours, then hove to till daybreak, and cruised back and forth all day, two men at the mastheads."
"He set sail and bore away into the west-north-west, two hunters constantly at the mastheads and sweeping the sea with glasses, himself pacing the deck like an angry lion."
"Lookouts at the mastheads could report no land, and the day passed in drizzling calms and violent squalls."